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40 lines
1.5 KiB
C
40 lines
1.5 KiB
C
/* Store current floating-point environment and clear exceptions.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <fenv.h>
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int
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feholdexcept (fenv_t *envp)
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{
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fexcept_t fpcr, fpsr;
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/* Store the environment. */
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__asm__ ("fmovem%.l %/fpcr/%/fpsr,%0" : "=m" (*envp));
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/* Now clear all exceptions. */
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fpsr = envp->status_register & ~FE_ALL_EXCEPT;
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__asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr));
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/* And set all exceptions to non-stop. */
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fpcr = envp->control_register & ~(FE_ALL_EXCEPT << 5);
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__asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (fpcr));
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return 1;
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}
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